Means for transmitting time signals



' July. 14, 1925..

H. RIEGGER "BANS FOR TRANSMITTING TIME SIGNALS Filed Nov. 18. 1924 Patented July 14, 1925.

UNITED STATES 1,545,523 PATENT; wricai,

HANS nineena, or PANKOW, NEAR BERLIN, RMANY; 'assienor. TO srnivrnns & HALSKE, AKTIENGESELLSCI-IAFT, .a'r slnivrnivssranr, NEAR BERLIN, GERMANY; a

CORPORATION 01? GERMANY.

MEANS roa TRANSMITTING TIME SIGNALS.

To all whom it may concern.

Be it known that I, HANS RIEGGER, a c1t1' zen of the German Empire, residingat Pankow, near Berlin, Germany, have invented certain new and useful Improvements in Means for Transmitting Time Signals, of which the following is a specification.

My invention relates to improvements in means for transmitting time signals. The object of my invention is to transmit such signals with a prescribedaccuracy.

According to my invention time signals which demand special accuracy are .given by the discharge current" of a condenser, the condenser being discharged across a selfinduction and an ohmic resistance" both of which are so dimensioned that the discharge requires a certain duration only which is determined by the prescribed accuracy. A time signal can only lay claim to accuracy if its own duration is not already so long that it exceeds itself the permissible limit of error. If high demands are made as to accuracy of the signal the duration of the signal itself must also be accurately dimensioned and for this dimensioning the condenser with its discharge current is an expedient which is as simple as it is satisfactory. The condenser enables the signal to be transmitted to distances either by wires or wireless. I

An embodiment of my invention is illus trated by way of example in the drawing affixed to this specification.

Refering to the drawing it will be seen that the condenser 1 is connected with the source of current 3 by means of a changeover switch 2 when the latter is in the position indicated in the drawing by broken lines.

When a time signal is to be given the switch 2 is turned into the position shown in full lines. The discharge current of the condenser then flows through the ohmic resistance 4i and the self-induction 5 which. together are so dimensioned that the discharge of the condenser is finished within a certain length of time which lies below the permissible limit of error. The discharge current from the condenser 1 decreased in the selfinduction coil 5 induces in the coil 6 a cur rent which charges the condenser 7. In the extinguishing spark distance 9 a series of Application filed. November 18,1924. Serial No. 750,552.

partial discharges are then generated each of which produces damped oscillations'in the oscillation circuit formed by the capacity 7 and the self-induction 8. These damped oscillations excite a tuned oscilla-, tion circuit formed by the self-inductions 10 and 11 and thecapacity-12. The oscillations passing through the coil 11 are radistructed is an absolute'guarantee thatthe duration of the signals sent out keep exactly the prescribed time. v

Time signals of the accuracy ensured by my'invention are, for instance, necessary if from the speed of propagation of vibrations of the surface of the earth conclusions are to bedrawn in regard to its condition. The vibrations are caused by blasting charges (Mintrop blasting). In order to ignite the blasting charge an electric contact is closed. Simultaneously with this operation the switch 2 can be turned into the position shown in full lines in the drawing. The time signals radiated by the aerial 13 are received at the various remote points where seismographs are erected.

What I claim as my invention is 1. Means for transmitting time signals with a prescribed accuracy comprising in combination, a condenser, a source of electric current, means for connecting said condenser with said source for charging it, an

electric circuit containing a self-induction coil and an ohmic resistance, means for connecting said condenser with said circuit so that'said condenser is discharged across said circuit, said self-induction coil and said ohmic resistance being so dimensioned that the duration of the discharge current lies within the prescribed accuracy limits, and

means adapted to transmit signals by theaid of said discharge current.

2. Means for transmitting time signals with a prescribed accuracy comprising in combination, a condenser, a source of electric current, means for connecting said condenser with said source forcharging it, an electric circuit containing a self-induction coil and an ohmicresistance means for 0011- necting said condenser with said circuit so that said condenser is discharged across said circuit, said self-induction coil and said I ohmic resistance beingso dimensioned that the duration of the discharge. cur-rent lies 3 Means for transmitting time signals with a prescribed accuracy comprising in combination, a condenser, a source-of electric current, means. for connecting said con-- denser with said source for charging it, an

electric circuit containing a self ind'uction coil and an ohmic resistance, means for connecting said condenser with saidcircuit so that said condenser is discl iarged across said circuit, said self-induction coil and said ohmic resistance being so dimen sioned that the duration of the discharge current 116$" Within the prescribed accu racy limits, an oscillating circuit containing an induction coil in. which a current is adapted to be induced by the discharge current from the condenser inthe first circuit, a condenser ad'apted to be charged by said induced current, an extinguishing spark distance, a capacity and a selfiinduction, and means for transmitting signals by the aid ofthe damped oscillations in said oscillating circuit.

with a prescribed accuracy comprising in combination, a condenser, a source of elec- 42-. Means for transmitting time signals ti'ic current, means for connecting said 0011- r denser with saidIsource for charging it, an electric circuit containing a self-induction coiland: olimi c resistance, means for connecting said condenser with said circuit so 1 that said condenser is discharged across said circuit, said self-induction coil and said ohmic resistance being so dimensioned that the duration of the discharge current lies within the prescribed accuracy limits, an oscillating circuit containing an induction coil l-n--Whl0l1 a current is adapted to be induced, by the discharge current from the condenser in the-'firstcircuit, a con-denser adapted to be charged by; said induced .current, an ext nguishing spark distance, a capacity and a self-induction, a tuned oscillating circuit containing self-inductions and a capacity and adapted to be excited by said first oscillating circuit and an aerial for rad ting the oscillations of said tuned oscillating circ-uitl.

In testimony whereof I affix my signat'ure; a

- J RIEGGER. 

